SAINTLY: Great Greens Smoothie

At 343 calories, this smoothie packs a nutrition punch that'll make you say "Top o' the mornin'!" Get iron from the spinach, potassium from the banana and a heap of cancer-thwarting compounds from the flaxseed. #winning.

SAINTLY: Apple-Limetini

A martini can be saintly? Believe it. Our version gets a superfood makeover with apples (the fruit's fiber is filling and helps stabilize blood sugar) and comes in at just 132 cals per drink. Use green apples to make your garnish even more holiday-appropriate.

A LITTLE SINFUL: Green Margaritas

So simple we wish we'd thought of it: Green juice with booze in it. Either make your own green juice or grab store-bought (the saintly part), throw in some orange liquor and tequila (the sinful part), and bam — a festive alternative to beer for your Shamrock party.

SORTA SINFUL: Guinness Stout

We know, we know: It's not green. But Guinness is such a staple of St. Patty's Day that we can't ignore it. A pint is 170 calories—a splurge, definitely, but lower in cals than you might imagine. After all, a good old Sammy Adams is 175 cals. (Fun tip: Pour the beer over a spoon to get that cool-looking separation).

PRETTY SINFUL: Emerald City Crush

Blue Curacao and triple sec combine to make a gorgeously green hue. With three alcohols (the base is Captain Morgan's rum), this tipple is delightfully sinful. Just take it easy to avoid a post-Paddy's Day hangover.

SUPER SINFUL: Shamrock Shake

At 530 calories, McDonald's' famous green shake is an over-the-top splurge, no doubt about it. But, you know, sometimes a craving hits. Just remember that it'll take a major cardio sesh to burn off those cals, so maybe share with a friend?